Pressure control switch



.May 9, 1950 w. c. TRAUTMAN PRESSURE CONTROL SWITCH Filed Nov. 14, 1945 gwuawiob imam U/a/lierC Wm Patented May 9, i950 umrso sr 'rss PATENT OFFICE PRESSURE CONTROL SWITCH Walter c. Trautman, Lou Angelou, Calif. Application November 14, 1945, Serial No. 628,448

1 Claim. (Cl. 200-82) 7 actuated by increased pressure to cause the open ing of said switch and the circuit controlled thereby; to provide in a control mechanism of the character referred to a cylinder in which is a piston and a ball which is bearing on the movable member, whereby when pressure in said cylinder increases sumciently to move said piston and said ball against said movable member to move or flex it, a snap or quick acting switch is permitted to act to open said circuit and stop the mechanism which is building up the pressure to be controlled; and in general, to provide an improved pressure control mechanism which can be installed in connection with any source of confined pressure, and connected also with the electric power mechanism which builds up said pressure.

In order to explain my invention more fully, I have illustrated a practical embodiment thereof on the accompanying sheet of drawings in which Figure l is a longitudinal sectional view through a control mechanism embodying my invention;

Figure 2 is a plan view of the snap switch used therein; and

Figure 3 is a sectional detail, taken on line 3I of Fig. 2. I

Referring now in detail to the drawings, I will describe the embodiment of the invention here shown. A housing or case having the bottom portion 5, and the top or cover portion 6, is constructed to receive a cylindrical member I, provided with an annular enlargement portion I which interflts with the cover portion, as clearly shown in the sectional view in Fig. 1. I The lower portion of this member has a cylinder 8 therein, reduced in diameter at its upper end, as at 9, and the upper portion is internally threaded, as at ill, for the purpose of connection with asource of pressure, which can be of any accumulating type, said pressure to operate in said cylinder on a piston H, having a sealing ring i2 thereon, and below which is a ball l3, bearing on a member I, having one end anchored between two pins, as at It, with its other end resting upon an adjustment screw it, operating through a self-locking nut, pressed into the bottom of the lower portion of the housing, as indicated. The screw ii has a rounded end, bearing in a shallow spot in the under side of said member it, as at I l. Said screw can be adjusted by turning, as with a screw-driver, as will be clear from the drawing, with a cover or finishing cap l'l thereon. In the bottom of said case is shown a stop lug it, as a limit stop for the movement or flexing of the member H, as indicated in light broken lines, and again referred to.

Mounted in said housing 5, and made of nonconducting material, is a box IS, with two terminal connections 20 and H- of metal, with an extension 22 from terminal 20, said extension supporting within said box the end of a snap or quick-acting switch member, composed of two members 23 and 24, the member 24 having its free end movable up through the open member 23, as clearly shown in Figs. 1 and 2. The two ends of saidmembers 23 and 24 are connected with an arched spring element 25, as shown. The end of the member 23 is provided with a contact element 23, adapted to move between a contact element 26, connected with the terminal member 2! by means of a metal strap 21, extended into said box, and a contact element 28, supported from a strap 29, but insulated from the circuit connections, as shown.

Operable through the bottom of said switch box 19, is a thrust member 30, bearing at its lower end on the spring member l4, and at its upper end under the member 24, as shown, for a purpose again referred to.

This snap switch is not new, but is standard equipment and is embodied in applicants invention as an element in the combination, with means for actuating it to open a, circuit controlled thereby--not shown. Said housing is provided with an insulated opening at 3| for the entrance of circuit wires to be connected with the terminals 20 and 2|. i

The use and operation of the invention may be briefly described as follows:

Connection with the source of pressure to be controlled is made at the threaded pipe connection i0, whereby pressure is conveyed to the piston il in the cylinder 8 and to the ball l3 and to the member it, which is of spring quality, or is flexible under pressure. As the parts are assembled, said spring member i4 is straight, with its free end resting on the adjustment screw Ii, which is down to the position indicated by P, at the right hand end of Fig. 1, and the thrust member 20 is also down, as indicated in the light broken lines, andthe switch is in opened position, with the contact member 28. When the parts I which the instrument is set, it moves the Piston II and ball I: downwardly and flexes said spring member H, as indicated by the light broken lines at the point of contact of the ball with said member, which is sufllcient to let the thrust member 30 move down and the switch member 24 with it, and this causes said switch to snap to the open position, as indicated in the light broken lines. The contact member 28, it will be clear, is not connected in any circuit, but it is a dead end contact member. When the pressure is reduced,

said member I4 again assumes the position shown in full lines, moves the thrust member 30 upwardly, and the switch is snapped to circuit closing position, and the power is again operating. Thus the switch, in the arrangement and connection shown, operates automatically to control the power, and said switch is controlled by the pressure transmitting means, which is simple, practical and Y I do not limit the invention to the details of construction and arrangement shown for explanatory purposes, except as I may be limited by the appended claim forming a part thereof.

4 I claim:

A pressure control mechanism or the character shown including a cylinder with piston therein and adapted to be connected with a source of pressure fluid, an enclosed switch mechanism with snap action, at one side of said cylinder, a bar extended across the open end of said cylinder and along side or said switch mechanism, said bar having one end anchored and its opposite end adjustably held, a bearing ball in said cylinder bearing on the piston and on said bar intermediate its ends, a thrust member extended through the housing for said switch mechanism and bearing on said bar at a point laterally removed trom said ball, and movable with said bar as it is moved by said piston under pressure in a said cylinder, whereby to cause said switch mechanismtooperate.

WaLTER C. TRAUTMAN.

REFEaENcEs emu The following references are of record-in the file of this patent:

. UNITED STATES PATENTS Number Name Date 850,412 Bell Apr. 16, 1907 1,619,219 Russell Mar. 1, 1927 1,960,020 McGall May 22, 1934 2,237,705 Kohl Apr. 8,1941 2,249,208 Jensen July 15, 1941 2,260,964 Wilms Oct. 28, 1941 2,268,340 Loomis Dec. 30, 1941 2,281,544 Beeman et ai May 5, 1942 2,281,764

Hanke May 5, 1942 

